Predict in how many of the following processes entropy change of the system is positive - i CaCO3s - CaOs - CO2gii N2g - 3H2g - 2NH3giii HClg - NH3g - NH4Clsiv 2SO2g - O2g - 2SO3gv Cooling of N2g from 20oC to -50oC

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Entropy of Phase Change

Predict in ho...

Question

Predict in how many of the following processes entropy change of the system is positive .
(i) $C a C O_{3} (s) \to C a O (s) + C O_{2} (g)$
(ii) $N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)$
(iii) $H C l (g) + N H_{3} (g) \to N H_{4} C l (s)$
(iv) $2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)$
(v) Cooling of $N_{2} (g)$ from $20^{o} C t o - 50^{o} C$

In all the processess

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C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)

H C l (g) + N H_{3} (g) \to N H_{4} C l (s)

2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)

N_{2} (g)

20^{o} C t o - 50^{o} C

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

N_{2} (g) + 3 H_{2} (g) \to 2 N H_{3} (g)

H C l (g) + N H_{3} (g) \to N H_{4} C l (s)

2 S O_{2} (g) + O_{2} (g) \to 2 S O_{3} (g)

N_{2} (g)

20^{o} C t o - 50^{o} C

A g (a q) + C l (a q) \to A g C l (s)

N H_{4} C l (s) \to N H_{3} (g) + H C l (g)

2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

△ H > △ U

I . A g^{+} (a q) + C l^{-} (a q) \to A g C l (s)

I I . N H_{4} C l (s) \to N H_{3} (g) + H C l (g)

I I I . 2 N H_{3} (g) \to N_{2} (g) + 3 H_{2} (g)

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